A little confusion about AJAX and inserting into DOM..

Posted by Gnee on Stack Overflow See other posts from Stack Overflow or by Gnee
Published on 2010-03-15T20:23:39Z Indexed on 2010/03/15 20:39 UTC
Read the original article Hit count: 297

Filed under:

AJAX

|

JSON

|

jQuery

|

php

I have this working great, but I'd like a deeper understanding of what is actually going on behind the scenes.

I am using Jquery's Ajax method to pull 5 blog posts (returning only the title and first photo). A PHP script grabs the blog posts' title and first photo and sticks it in an array and sends it back to my browser as JSON.

Upon receiving the JSON object, Jquery grabs the first member of the JSON object and displays it's title and photo. In a gallery I made, using buttons – the user can iterate the 1-5 posts.

So the actual AJAX call happens right away, and only once. I am basically using this kind of setup: $('my_div').html(json_obj[i]) and each click does a i++.

So jquery is plucking these blog posts from my computers memory, my web browsers cache, or some kind of cache in the Javascript engine?

One of the things it's returning is a pretty gnarly animated gif. I just wonder if it constantly running in the background (but not visible), stealing processing cycles...etc. Or Javascript just inserting (say a flash movie) into the DOM, but before hand does nothing but take up a little memory (no processing).

Anyway, I'm just curious. If someone is a guru on this, I'd love to hear your take. THanks!!

© Stack Overflow or respective owner

Related posts about AJAX

Ajax call from a form rendered as Ajax response (jQuery + Grails: chaining ajax requests)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I was expecting the below scenario common, but couldn't find much help online. I have a form loaded through Ajax (say, create entity form). It is loaded through a button click (load) event $("#bt-create").click(function(){ $ ('#pid').load('/controller/vehicleModel/create3'); … >>> More
Ajax Control Toolkit Now Supports jQuery

as seen on Stephen Walter - Search for 'Stephen Walter'
I’m excited to announce the September 2013 release of the Ajax Control Toolkit, which now supports building new Ajax Control Toolkit controls with jQuery. You can download the latest release of the Ajax Control Toolkit from http://AjaxControlToolkit.CodePlex.com or you can install the Ajax Control… >>> More
The Microsoft Ajax Library and Visual Studio Beta 2

as seen on Stephen Walter - Search for 'Stephen Walter'
Visual Studio 2010 Beta 2 was released this week and one of the first things that I hope you notice is that it no longer contains the latest version of ASP.NET AJAX. What happened? Where did AJAX go? Just like Sting and The Police, just like Phil Collins and Genesis, just like Greg Page and the Wiggles… >>> More
Video Aulas gratuitas de ASP.NET AJAX

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Olá pessoal, A Microsoft publicou 14 vídeos que cedi a eles a respeito do ASP.NET AJAX. Todos os vídeos são gratuitos, e caso você ainda use o AJAX estas lições podem ajudá-lo bastante. Tenha um excelente estudo. Instalação do AJAX Control Tookit ASP.NET AJAX: Controle calendário ASP.NET… >>> More
July 2013 Release of the Ajax Control Toolkit

as seen on Stephen Walter - Search for 'Stephen Walter'
I’m super excited to announce the July 2013 release of the Ajax Control Toolkit. You can download the new version of the Ajax Control Toolkit from CodePlex (http://ajaxControlToolkit.CodePlex.com) or install the Ajax Control Toolkit from NuGet: With this release, we have completely rewritten the… >>> More

Related posts about JSON

Using JSON.NET for dynamic JSON parsing

as seen on West-Wind - Search for 'West-Wind'
With the release of ASP.NET Web API as part of .NET 4.5 and MVC 4.0, JSON.NET has effectively pushed out the .NET native serializers to become the default serializer for Web API. JSON.NET is vastly more flexible than the built in DataContractJsonSerializer or the older JavaScript serializer. The DataContractSerializer… >>> More
Azure Mobile Services: what files does it consist of?

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Azure Mobile Services is a platform that provides a small set of functionality consisting of authentication, custom data tables, custom API’s, scheduling scripts and push notifications to be used as the back-end of a mobile application or if you want, any application or web site. As described in my… >>> More
Retrieving Json Array

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am trying to retrieve the values from the following url: http://rentopoly.com/ajax.php?query=Bo. I want to get the values of all the suggestions to be displayed in a list view one by one. This is how i want to do... public class AlertsAdd { public ArrayList<JSONObject> retrieveJSONArray(String… >>> More
Deserializing JSON data to C# using JSON.NET

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm relatively new to working with C# and JSON data and am seeking guidance. I'm using C# 3.0, with .NET3.5SP1, and JSON.NET 3.5r6. I have a defined C# class that I need to populate from a JSON structure. However, not every JSON structure for an entry that is retrieved from the web service contains… >>> More
Parsing nested JSON objects with JSON Framework for Objective-C

as seen on Stack Overflow - Search for 'Stack Overflow'
I have the following JSON object: { "response": { "status": 200 }, "messages": [ { "message": { "user": "value" "pass": "value", "url": "value" } ] } } I am using JSON-Framework (also tried JSON Touch) to parse through this and… >>> More